I'll have you know it took me a full five min...mmm Invisible Girl...utes to read your post.
I bet there are a few teachers out there quite proud of their illiterate students. Here in Texas (something like) 20% of the teachers cannot pass a basic skills test.
lol! Your standards are way too high. The average penny freek Ihubber can't even use "to, too, there, their, they're, lose, loose, then, than, see, saw, seen correctly. Asking them to put things in the proper context is a pipe dream!